Table 3.
Effects of density and nitrogen application rate on 13C-photosynthate proportional allocation among above-ground plant organs (%) at the tasseling stage during the 2014 and 2015 growing seasons.
| Factors | 13C-photosynthate distribution in different organs (%) | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| 2014 | 2015 | ||||||||||
| Stem | Other leaves | Ear leaf | Tassel | Bract + Cob | Stem | Other leaves | Ear leaf | Tassel | Bract + Cob | ||
| DH618 | |||||||||||
| LD | N0 | 52.48b | 30.81bc | 4.55c | 4.72c | 7.43e | 54.2b | 29.11b | 5.21f | 4.16b | 7.31f |
| N180 | 51.02cd | 30.84bc | 4.35d | 4.84b | 8.96b | 52.97cd | 28.95b | 5.41de | 4.26a | 8.41c | |
| N270 | – | 52.55cd | 29.25ab | 5.48bc | 4.15b | 8.57b | |||||
| N360 | 50.48e | 30.93bc | 4.41d | 4.98a | 9.21a | 52.2d | 29.39ab | 5.54b | 4.15b | 8.73a | |
| HD | N0 | 53.14a | 30.49c | 4.77b | 4.57d | 7.04f | 55.69a | 29.29ab | 4.77g | 3.87d | 6.38h |
| N180 | 51.46c | 31.09b | 4.56c | 4.75c | 8.14c | 54.25b | 29.32ab | 5.39e | 3.97c | 7.08g | |
| N270 | – | 53.39c | 29.80ab | 5.47cd | 3.86d | 7.49e | |||||
| N360 | 50.77d | 31.39a | 5.02a | 4.57d | 8.24d | 52.79cd | 30.09a | 5.65a | 3.85d | 7.62d | |
| DH605 | |||||||||||
| LD | N0 | 54.18b | 28.80a | 4.19c | 2.57a | 10.26d | 55.36c | 28.55a | 4.42e | 2.84b | 8.83e |
| N180 | 52.44c | 28.91a | 4.21bc | 2.46b | 12.32b | 54.69d | 28.53a | 4.60c | 2.83b | 9.35c | |
| N270 | – | 54.45d | 28.32b | 4.78b | 2.80c | 9.65a | |||||
| N360 | 51.91c | 29.09a | 4.65a | 2.46b | 12.98a | 54.45d | 28.48a | 4.83a | 2.71e | 9.53b | |
| HD | N0 | 56.30a | 27.80b | 4.02d | 2.29c | 9.60e | 56.25a | 28.31b | 4.32f | 2.83b | 8.28f |
| N180 | 54.83b | 28.44ab | 4.18c | 2.21d | 10.34d | 55.73b | 28.24b | 4.43e | 2.79c | 8.81e | |
| N270 | – | 55.55bc | 28.2b | 4.44e | 2.77d | 9.04d | |||||
| N360 | 54.34b | 28.59a | 4.27b | 2.26cd | 10.54c | 55.41bc | 28.19b | 4.47d | 2.87a | 9.06d | |
| ANOVA | |||||||||||
| Density (D) | 109.4*** | 6.1* | 31.2*** | 525.5*** | 3,543.2*** | 507.7*** | 12.4** | 933.4*** | 1,578.3*** | 3,032.6*** | |
| N rate (N) | 85.1*** | 11.3*** | 137.6*** | 4.2* | 2,079.2*** | 258.9*** | 14.2*** | 1,224.3*** | 84.6*** | 1,004.6*** | |
| Variety (V) | 309.7*** | 583.6*** | 688.4*** | 59,389.4*** | 18,278.8*** | 1,464.8*** | 1,082.1*** | 22,690.6*** | 126,294.3*** | 8,308.7*** | |
| D × N | 0 ns | 4.9* | 4.8* | 13.8*** | 355.4*** | 4.7** | 3.7* | 45.6*** | 49*** | 7.7** | |
| D × V | 42.2*** | 18.5*** | 403.3*** | 2.4 ns | 372.8*** | 0.3 ns | 117.4*** | 196.7*** | 2,092.8*** | 364.7*** | |
| N × V | 0 ns | 0.1 ns | 48*** | 59.1*** | 63.9*** | 55.1*** | 28.5*** | 169.8*** | 63.7*** | 66.4*** | |
| D × N × V | 0.3 ns | 0.5 ns | 76.3*** | 33.2*** | 43.9*** | 6.1** | 3.4* | 260*** | 51.1*** | 8.8*** | |
Different lowercase letters indicate a significant difference (p < 0.05) with the same organ of the same variety among treatments. The numbers in the ANOVA section represent F values. ns, not significant. *Significant at the 0.05 probability level. ***Significant at the 0.01 probability level. ***Significant at the 0.001 probability level.